An optical recording medium having a scratch-off material layer includes a transparent substrate, a reflective layer formed on the transparent substrate, a protective layer formed on the reflective layer, information formed on a surface of the protective layer, and at least one opaque scratch-off material...http://www.google.fr/patents/US20030223348?utm_source=gb-gplus-shareBrevet US20030223348 - Scratch-off material layer applied on optical recording media
Scratch-off material layer applied on optical recording media
Numéro de demande: 10/064,598 Numéro de publication: US 2003/0223348 A1 Date de dépôt: 29 juil. 2002 Brevet délivré: US6901043 ( Date de délivrance 31 mai 2005)
